The​ Pittsburgh Steelers made a move to improve their secondary, agreeing to terms on a three-year deal with cornerback Steven Nelson.

The contract:

Per Ian Rapoport of NFL Network, the three-year deal is for $25.5 million.

Why they made the move:

The Steelers entered the offseason in need of a cornerback to play opposite Joe Haden. As Mark Kaboly of The Athletic reported, GM Kevin Colbert said at the combine that Artie Burns took a step backward last year and needs to find his confidence.

Nelson is not a shutdown corner, but he gives Pittsburgh a starting-caliber player to pair with Haden. Nelson’s aggressiveness was a blessing and a curse last year. His 15 passes defended ranked tied for fifth leaguewide, and he also had four interceptions. But Nelson was susceptible to double moves, and his 121 penalty yards were third-most among cornerbacks.

Pittsburgh’s defense finished 17th against the pass last season. But the...